:root {
  --ink: #08090a;
  --muted: #565d67;
  --line: #cfd3d8;
  --paper: #f5f6f7;
  --panel: #ffffff;
  --blue: #1e63c4;
  --blue-soft: #eaf2ff;
  --cyan: #6dcbf4;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--panel); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; line-height: 1.5; }
a { color: var(--blue); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 3px solid #8bb8ff; outline-offset: 3px; }

.module-nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 12px 24px; border-bottom: 1px solid var(--line); background: #fff; }
.course-brand-link { color: var(--ink); font-size: 17px; font-weight: 900; line-height: 1.1; text-decoration: none; }
.module-context { min-width: 0; }
.module-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px 18px; font-size: 14px; font-weight: 800; }

.course-main { width: min(1160px, calc(100% - 36px)); margin: 0 auto; padding: 66px 0 100px; }
.eyebrow { margin: 0 0 12px; color: var(--blue); font-size: 13px; font-weight: 900; letter-spacing: .09em; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.05; letter-spacing: -.025em; }
h1 { max-width: 990px; margin: 0; font-size: clamp(48px, 7.5vw, 88px); }
h2 { margin: 0; font-size: clamp(31px, 4vw, 48px); }
h3 { margin: 0; font-size: 24px; }
.lede { max-width: 840px; margin: 24px 0 0; color: var(--muted); font-size: clamp(19px, 2.2vw, 24px); line-height: 1.45; }
.course-intro { max-width: 800px; font-size: 19px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button { min-height: 48px; display: inline-flex; align-items: center; padding: 11px 16px; border: 1px solid var(--ink); background: var(--ink); color: #fff; font-weight: 900; text-decoration: none; }
.button.secondary { background: #fff; color: var(--ink); }

.course-status { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; margin-top: 48px; border: 1px solid var(--line); background: var(--line); }
.course-status > div { min-height: 132px; padding: 20px; background: #fff; }
.course-status span { display: block; color: var(--blue); font-size: 12px; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.course-status strong { display: block; margin-top: 18px; font-size: 20px; line-height: 1.2; }

.course-section { scroll-margin-top: 24px; margin-top: 88px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 28px; margin-bottom: 28px; }
.section-heading > div { max-width: 760px; }
.section-heading p { margin: 12px 0 0; color: var(--muted); font-size: 18px; }
.section-heading > a { flex: 0 0 auto; font-weight: 900; }

.course-module-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.course-module-card { min-height: 260px; display: grid; grid-template-rows: auto auto 1fr auto; padding: 22px; border: 1px solid var(--line); border-top: 4px solid var(--blue); background: var(--paper); color: var(--ink); text-decoration: none; }
.course-module-card:hover { border-color: var(--blue); background: var(--blue-soft); }
.course-module-card > span { color: var(--blue); font-size: 12px; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.course-module-card h3 { margin-top: 22px; }
.course-module-card p { color: var(--muted); }
.course-module-card strong { align-self: end; color: var(--blue); }

.session-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.session-grid.compact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.session-card { min-height: 290px; display: grid; align-content: start; padding: 24px; border-top: 3px solid var(--ink); background: var(--paper); }
.session-card .session-number { color: var(--blue); font-size: 12px; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.session-card h3 { margin-top: 22px; }
.session-card p { color: var(--muted); }
.session-card a { align-self: end; font-weight: 900; }

.resource-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.resource-card { min-height: 190px; padding: 22px; border: 1px solid var(--line); background: #fff; }
.resource-card span { color: var(--muted); font-size: 12px; font-weight: 900; letter-spacing: .07em; text-transform: uppercase; }
.resource-card h3 { margin-top: 18px; }
.resource-card p { color: var(--muted); }
.resource-card a { font-weight: 900; }
.supplementary { padding: clamp(22px, 4vw, 38px); background: var(--paper); }
.supplementary .section-heading { margin-bottom: 24px; }

.course-footer { padding: 24px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }

@media (max-width: 860px) {
  .course-module-grid, .session-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .module-nav { align-items: flex-start; flex-direction: column; gap: 12px; padding-right: max(16px, env(safe-area-inset-right)); padding-left: max(16px, env(safe-area-inset-left)); }
  .module-context { width: 100%; }
  .module-links { width: 100%; justify-content: flex-start; gap: 10px 15px; }
  .course-main { padding-top: 44px; }
  .course-status, .course-module-grid, .session-grid, .session-grid.compact, .resource-grid { grid-template-columns: minmax(0, 1fr); }
  .course-status > div { min-height: auto; }
  .course-module-card { min-height: 225px; }
  .section-heading { align-items: flex-start; flex-direction: column; }
  .course-section { margin-top: 66px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}